Function isClass

test/angular/1.7/angular.js:5116–5127

(func)

    }

    function isClass(func) {
      // Support: IE 9-11 only
      // IE 9-11 do not support classes and IE9 leaks with the code below.
      if (msie || typeof func !== 'function') {
        return false;
      }
      var result = func.$$ngIsClass;
      if (!isBoolean(result)) {
        result = func.$$ngIsClass = /^class\b/.test(stringifyFn(func));
      }
      return result;
    }

    function invoke(fn, self, locals, serviceName) {
      if (typeof locals === 'string') {